链格孢对ICR小鼠致病性的研究

目的 探讨链格孢对ICR小鼠的致病性.方法 将链格孢的菌悬液分别接种于正常和免疫抑制ICR小鼠的睾丸和足垫,于接种后的第5、7、10、14、21、28、35和42天处死动物,取接种部位的组织和各脏器进行组织病理学检查和逆培养.结果 正常组和免疫抑制组小鼠的接种部位均出现脓肿,免疫抑制组较正常组组织损害程度重,且持续时间长;足垫接种小鼠在正常组脓肿14d自行消退,在免疫抑制组28～35d消退.正常组和免疫抑制组小鼠的接种部位组织逆培养均阳性,组织病理观察见脓肿、粗大菌丝、肉芽肿.实验小鼠均未出现系统播散.结论 链格孢对ICR小鼠是致病性很弱的机会致病菌.

Pathogenicity of Alternaria alternata in ICR Mice

Objective To investigate the pathogenicity of Alternaria alternata in ICR mice. Methods The cell suspension of Alternaria alternata was inoculated into testes and footpads of normal and immunocompromised ICR mice. H istopathologic examination and fungal culture were performed on 5th d, 7th d, 10 th d, 14th d, 21st d, 28th d, 35th d and 42nd d respectively after inoculation. Results The abscesses were developed at the inoculated sites in all normal and immunocompromised mice. The lesions in immunocompromised mice were more severe and persisted longer than those in normal mice. The abscesses in footpads mostl y disappeared within 14 days in normal mice but in 28 to 35 days in immunocompro mised mice. Alternaria alternata was isolated from the inoculated tissues in bot h groups. The histopathologic examination showed abscess and granulomas in which thick hyphae were observed. The necropsy revealed no disseminated infection of Alternaria alternate in all the test mice. Conclusion Alternaria alternata is a kind of opportunistic fungus with low virulence.